Berlin Wall
Was a former barrier that surronded West Berlin and a symbol of the cold war and it was built August 13, 1961. It divided the British, French and The Soviet Union. It was 96 miles long and had barb wire all over and it was a concrete wall and was 11 feet high. It fell because people protested against it and they took it down.
Star Wars (SDI)
It is a strategy proposed by reagen to use ground based systems to protect the US from being attacked by nuclear missiles. The initiative focused on a defense rather then a strategy.Its also called the Star Wars Plan.